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Helianthus neglectus
Heiser
Family:
Asteraceae
Neglected Sunflower
Robert Sivinski
FNA
Resources
Edward E. Schilling in Flora of North America (vol. 21)
Annuals,
80-200 cm.
Stems
erect (leafy), ± hispid to glabrate.
Leaves
cauline; alternate; petioles 7-12 cm; blades deltate-ovate, 7-14 × 7.5-12.3 cm, bases usually ± cordate, sometimes truncate , margins subentire to serrulate, abaxial faces strigose, not gland-dotted.
Heads
1-5.
Peduncles
10-40 cm.
Involucres
± hemispheric, (23-28 ×) 10-14 mm.
Phyllaries
25-35, lanceolate, 14-25 × 2.3-4 mm (surpassing discs), apices long-attenuate, abaxial faces strigillose to hispid.
Paleae
9-10 mm, 3-toothed (middle teeth ± ciliate or bearded, hairs whitish, 0.3-0.6 mm).
Ray florets
21-31; laminae 29-39 mm.
Disc florets
150+; corollas 6-6.5 mm, lobes reddish; anthers dark, appendages purplish (style branches reddish).
Cypselae
4-5 mm, strigillose to glabrate
; pappi
of 2 aristate scales 2.8-3.2 mm.
2
n
= 34.
Flowering summer-fall. Sandy soils, sand dunes; of conservation concern; 800-1100 m; N.Mex., Tex.
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Robert Sivinski
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